近似方法

During the BPSE process, a high-speed special mode frame is sent, bit error rate is fed back to the sender, as well as signal to noise and BERs for each rate are obtained by looking up the empirical BER/SNR curve. During the SLRA process, the equation of goodput relative to BER and frame length is solved, to obtain the maximized goodput and its related BER and frame length.

SLRA先通过求解有效带宽、BER和包长度的解析方程，然后得到各种速率下的最优有效带宽、及其相应的包长度，从而在理论上优化有效带宽；由于SLRA计算过程非常复杂，我们提出了近似查表的方法来简化优化过程，使得其适用于便携式通信设备。

This paper explorates the method of nonlinear approximate equation root of" secant line rule"in theory,and disusses two vertexes of secant line rule and one vertex of secant line rule with two kinds of different thought methods and in order to clear some suspicions of learners,which is used as a reference.

现对"割线法"求解非线性方程近似根的方法，从理论上进行了探讨，并用两种不同的思维方式双点割线法和单点割线法进行讨论，来澄清学习者的一些疑惑，以供参考。

With experience gained from the Finite Element method, a quasi-linear model based on the Magnetic Equivalent Circuit method has been used to obtain the static torque of the motor. Three types of magnetic tubes are employed in the model, and through the exchange principle of magnetic lines of force and magnetic equipotential line, the tube in which the flux distribution is non-uniform is applied to the model.

通过分析电机二维磁场分布和考虑电机特殊的电磁结构，提出了用三种磁通管单元来近似磁场分布，并借用磁力线和等磁位线互换的方法，将磁力线分布不均匀的磁通管引入到分析模型中，有效的处理了平动式啮合电动机中的磁场分布不均匀和磁路局部饱和，使分析模型得到简化并兼顾了求解精度。

According to the field plot of TE10 wave mode in rectangular ridged waveguide,the equivalent capacitance and equivalent inductance are approximately calculated by quasi-static method,and the resonant frequency which is namely cutoff frequency is derived.

由矩形正脊波导中主模TE10波模的分布结构特征，用准静态方法近似的计算出等效电容和等效电感，从而计算出谐振频率，也就是矩形正脊波导的截止频率。

This paper discusses a method, which can be used to approximately calculate the equivalent resistance and to approximately calculate the efficiency of different topologies. It could benefit a lot in designing DC-DC converters.

本文提出了一种近似计算等效电阻的方法，其原理是将变换器中各元件的损耗之和等效为输出电阻的损耗，可以简便计算变换器的效率，有助于选择合适的电路。

Based on the equivalent transformation from fuzzy possibility distribution to random probability density distribution, the fuzzy random failure probability calculation can be formulated easily, and a First Order and Second Moment method for fuzzy - random analysis is established.

提出了模糊随机可靠性分析的近似解析和数字模拟综合方法，基于模糊变量的等价随机化变换，可以方便地得到模糊随机失效概率的计算公式，并建立了模糊随机可靠性分析的一次二阶矩法。

Both upper bound formula and lower bound formula of the global truncation error of Euler method have been derived theoretically.After making certain approximat e processing,the derived upper formula changes into current upper bound formula.

从理论上推导出了欧拉方法的整体截断误差的上限公式和下限公式，作一定的近似后，得到的整体截断误差上限公式就变为现用的整体截断误差上限公式。

In the dissertation, meshless element free Galerkin method which utilizes moving least square is used for solving heat transfer problems. Lagrange multiplier method is used to deal with the essential boundary condition. Some parameters in element free Galerkin method, which influence the precision, are also discussed in the numerical simulation. The adaptive method of meshless method is also stated.

本文采用了基于移动最小二乘近似的无网格伽辽金法计算了热传导问题，采用拉格朗日乘子处理本征边界条件；讨论了无网格伽辽金法各个计算参数在数值模拟中对计算精度的影响；并对无网格的自适应方法进行了研究。

In this paper the event tree is used in the analysis on cascading failures and by use of probability approximation theory of rare event the probability order of multiple failures is divided, thus the screening process of multiple failures can be simplified.

文章采用事件树对连锁故障的分析方法，运用小概率事件的概率近似理论对多重故障进行概率阶次划分，可以简化多重故障的筛选过程。

Yet, the number of instance the exact solution can be found byanalytical means is very limited.

因此，有必要用数值方法得到微分方程的近似解。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。